What breed of chick did they sell me?

I'm brand new here, but I thought you Chicken People could help me! I love this forum and have enjoyed lurking for the past few months!

So a few days ago I went to Coastal Farm and Ranch with the intention to buy one, solitary Polish chick! I was very excited, because she was to be my fancy chicken! Unfortunately, the chick I picked doesn't appear to be a Polish and I'm having trouble distinguishing what breed she might be. I'm thinking she's possibly a Barred Plymouth Rock. Any thoughts? She's growing much slower than the rest of my chicks and her beak is a bit funny. Thanks in advance for any help!

I love her anyway, but I'm super sad! It was my responsibility to make sure I picked the correct chick out of the Polish straight run bin, but there WAS an employee there who was helping who also didn't know the difference. I wish the employees who handled the chicks were more knowledgeable on breeds.